Lamp-guard.



G. E. PURPLE.

LAMP GUARD.

APPLICATION FILED IULY 26. |915. 1,298,897. Patented Mar. 25,1919.

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A and with an ear 18l on the opposite UNITED sTATEs PATENT oEEIoE.

GEORGE E. PUEILE,

co., or CHICAGO, ILLINOIS,

0F LA GRANGE, ILLINOIS, ASSIGNOR TO FLEXIBLESTEEL LACING A CORPORATIONOF ILLINOIS.

LAMB-GUARD.

Application filed July 26, 1915.

To all whom it may concern:

Be it known that I, GEORGE E. PURPLE, a citizen of the United States,residing at La Grange, in the county of Cook and State of Illinois, haveinvented new and useful Improvements in Lamp-Guards, of which thefollowing is a full, clear, concise, description, reference being had tothe accompanying drawing, forming a part of this specification. l

My invention relates-to lamp guards and the like, and more specificallyto means for securing two sections of a lamp guard placed on the socketin such manner that it will be diflicult for an unauthorized person toremove the guard from the socket.

One of the objects of my invention is to rovide an improved device ofthis character which shall be simple in construction, ellicient in useand easy to manufacture. v

Further objects will appear from the description taken in connectionwith the appended claims.

In the drawings, in which I have shown one embodiment of my invention-Figure 1 is a side elevation showing a lamp guard secured in place on asocket;

Fig. 2 is a side elevation of one of the securing screws, the head beingshown in section on the line 2-2 of Fig. 3;

Fig. 3 is a plan view of the securing screw;

Fig. 4 isa section on the line 4-4 of Fig. 1 showing the manner in whichthe two sections o@ the guard are secured together; and

Fig. 5 is a securing the guard in place on and removing it. A

Referring now to the drawings in detail I have shown my invention inconnection with a lamp guard, indicated in general at 10, comprising twosimilar sections 11. Each of these 'sections comprises an upper andlower semi-circular member 12 and 13 respectively. united by ribs 14which are shaped and positioned so that the two sections, when placedtogether. will inclose the bulb of an electric lamp. The lowersemi-circular members 13 are hingedly secured together in any suitablemanner as shown at 15. Each of the upper semi-circular members 12 isprovided with an ear 16 having an opening 17 therethrough end providedwith an opening 19 therethrough. The ear 18 is provided .with an annularupstanddetail showing a key used in the socket Specification of LettersPatent.

and exact Patented Mar. 25, 1919.

seria1No.41,9s3.

ing flange 20 stamped up therefrom and which is internally screwthreaded for engagement with the screw which secures the two sections ofthe guard together. Each member 12 is beaded outwardly as shown at 21for engagement with a corresponding bead on the lamp socket 22 wherebywhen the members 12 are drawn together the guard will be securelyclamped on the socket and held in place. The members 12 are heldtogether by means of two screws 423 each of which comprises a threadedportion 24 for engagement with the internally threaded flange 20, asmooth reduced neck portion 25 which lies within the opening 17 when themembers 12 are clamped together, and a frusto-conical head 26 whichengages the ear 1G. The head 26 is provided with a recess or socket 27,the walls of which comprise cylindrical portions 28, angular grooves 29lying between the cylindrical portions 28, for engagementlwith thecorrespondingly shaped portions of a key, a flaring portion 30 forguiding the key into engagement with the groove portion of the socket,anda conical portion 31 at the bottom of the socket. The upper part ofthe head of the screw is flattened slightly as shown at 32 to prevent asharp edge being formed thereon. The

screw 23 is operated by means of a bent wire key 33 (Fig, 5) comprisinga handle portion 34, a stem portion 35 and a triangular socket engagingportion 36, the edges of which fit into the grooves 29 of the socket 27.

The use and operation of my improved device is as follows: The key 33 isinserted in the socket 27 of the screw 23 and rotated to unscrcw thelatter from the `threaded flanges 20. The'two sections 11 are thenopened about the hinges 15 and brought in position' about the bulb ofthe lamp and the portions 12' are then vbrought into engagement wit thesocket 22, the bead 21 fitting over the corresponding bead of thesocket. The screws 23 are then again threaded into the flanges 20 bymeans of the key 33 to clamp the members 12 tightly against the socket22.

The unthreaded apertures 17 in the ears 16 are just large enough topermit the threaded portion 24 of the screw 23 to be threadedtherethrough. This construction will prevent the screws from falling outof the ears 16 when they are not threaded into the flange 20. The neckportion 25 of the screw is small enough to permit the screw to rotatefreely in the opening lZ after 'the portion 24 has been threadedtherethrough-` The head 26 is made frusto-conical (being beveledoii atan angle of 22g`O to the axis of the screw) in order that it may beverydiiiicult for anyone to et a good hold on the head ofthe screw gy meansof a. pair of pliers or the like, as the jaws of the pliers will slipoff of the inclined surface. The

screws y23 can be made very quickly and cheaply on an/automatic machineand all three/of the grooves 2.9 can bemade by a sin fle operation ofthe press.

' aving thus described my invention what l5 I Aclaim as new and desireto secure by Letters Patent is 1. Means for securing two portions Aof alamp guard having registering apertures tol gether comprising a screwfor extending through one of said apertures and for threading into theother aperture, said screw having -a high, upwardly tapering Afrustoconica head having an axial non-circular .socket therein whereby saidsocket may be engaged by a non-circular key portion and whereby saidhead cannot be firmly grasped by pliers or rthe like.

2. Means lfor securing two portions ofa lamp guard having registeringapertures together comprising a screw for extending through one of -saidaperturesv and for threading into the other aperture, said'screw ihaving a head having an axial socket therein,

portions of the Walls of ssaid socket being cylindrical, ,saidcylindrical portions being separated by an outwardly-closed key engaginggroove.

In witness whereof, I have hereunto suhscribed my name..

GEORGE E. PURPLE.

